title: Integrated spatial multiplexing of heralded single-photon sources.
abstract: The non-deterministic nature of photon sources is a key limitation for single-photon quantum processors. Spatial multiplexing overcomes this by enhancing the heralded single-photon yield without enhancing the output noise. Here the intrinsic statistical limit of an individual source is surpassed by spatially multiplexing two monolithic silicon-based correlated photon pair sources in the telecommunications band, demonstrating a 62.4% increase in the heralded single-photon output without an increase in unwanted multipair generation. We further demonstrate the scalability of this scheme by multiplexing photons generated in two waveguides pumped via an integrated coupler with a 63.1% increase in the heralded photon rate. This demonstration paves the way for a scalable architecture for multiplexing many photon sources in a compact integrated platform and achieving efficient two-photon interference, required at the core of optical quantum computing and quantum communication protocols.
authors.affiliation: Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), Institute of Photonics and Optical Science (IPOS), School of Physics, University of Sydney, Sydney, New South Wales 2006, Australia.
authors.forename: M J
authors.initials: MJ
authors.lastname: Collins
authors.forename: C
authors.initials: C
authors.lastname: Xiong
authors.forename: I H
authors.initials: IH
authors.lastname: Rey
authors.forename: T D
authors.initials: TD
authors.lastname: Vo
authors.forename: J
authors.initials: J
authors.lastname: He
authors.forename: S
authors.initials: S
authors.lastname: Shahnia
authors.forename: C
authors.initials: C
authors.lastname: Reardon
authors.forename: T F
authors.initials: TF
authors.lastname: Krauss
authors.forename: M J
authors.initials: MJ
authors.lastname: Steel
authors.forename: A S
authors.initials: AS
authors.lastname: Clark
authors.forename: B J
authors.initials: BJ
authors.lastname: Eggleton